Razor hone



March 22, 1938. J, KOLL ER 2,111,667

RAZOR HONE Filed Feb. 23, 1937 -41 m i4 4 27 i4 is 2; 31

Patented Mar. 22, 1938 RAZOR HON E William J. Keller, Olean, N. Y.,assignor to Union Cutlery 00., Inc., Olean, N. Y., a corporation of NewYork Application February 23, 1937, Serial No. 127,245

2 Claims. (Cl. 51-4211) My invention relates to improvements in hones orwhetstones for use particularly in sharpening so-called straight razorsalthough it is adapted for sharpening safety razorand other blades aswill presently appear. 1

As is well-known, it is practically impossible to draw the cutting edgeof a razor blade flat across the usual fiat stone or hone because, onthe one hand, of variations in the cutting edge of the blade, forinstance high and low spots, and, on the other hand, because ofvariations in the edge contours of the back of such blades due either tothe style of the blade or to wear of the back edges of the blade fromhoning or sharpening operations.

With the foregoing in mind, it is the primary purpose of my invention toprovide a sharpening stone, or hone, having a sharpening surface overwhich a razor, or other blade may be easily moved with a sweeping strokeflat against said surface and with perfect uniform contact between thecutting edge of the blade and said surface throughout the entire lengthof the blade and regardless of the irregularities in either the edge ofthe blade or in the edge contour of the back of the blade.

To the accomplishment of the above, my invention comprises a block ofabrasive material having a concavo-convex upper face forming a segmentalsharpening zone extended inwardly from one edge of the block from end toend thereof and merging at its rear into a concave-convex ridge curvinginwardly from said edge in a long sweeping arc, the sharpening zonebeing formed transversely in different convex curvatures such that thecutting edge of a blade moved along said zone in a, sweeping curve andwith a draw stroke substantially radial to said ridge may be alwaysmoved flat against a sharpening surface.

The accompanying drawing illustrates a preferred embodiment of myinvention as set forth in greater detail in the following descriptionand defined in the claims appended hereto.

In said drawing:

Figure 1 is a view in top plan of a stone or hone constructed accordingto my invention.

Figure 2 is an end View of one end of the stone.

Figure 3 is a similar view of the other end of the stone.

Figure 4 is a view in transverse section taken on the line 4-4 of Figure1 looking in the direction indicated by the arrows.

Figure 5 is a similar view taken on the line 5--5 of Figure 1,

Figure 6 is another similar view taken on the line 6-45, and

Figure '7 is a view in front elevation.

Referring to the drawing by numerals, the hone of my invention comprisesa block l of stone or. other abrasive material, such as carborundum, ofsubstantially rectangular form and having 5 straight front and rearsides 2 and 3, respectively, straight ends 4, a flat lower face 5, andan upper face 6. The upper face 6 of the block is longitudinally concavefrom end to end of said block, as indicated at 'l and convextransversely as indi- 10 cated at 8. The transverse contour of the upperface 6 is formed in different curvatures throughout different zones ofsaid face, as indicated in Figures 2' to 6, said curvatures varyinguniformly from opposite ends of the stone inwardly thereof 15 to form asegmental sharpening zone 9 extending from end to end of the stoneinwardly of the front side 2 and merging at its rear into a transverselyconvex ridge Ill curving from said side 2 in a long sweeping arc Thetransverse curvatures 2 of the face 1 may be in the form of irregularcurves, as shown in Figures 2 to 6, properly graduated to provide thelongitudinal concavity and the described ridge l3 and said curvaturesmay be the same or different as desired the important 25 desideratumbeing that they form the longitudinally concave and transversely convexsegmental sharpening zone 9, and the similarly shaped ridge l0described.

In the use of my improved stone or hone a razor 30 blade, indicated at ll in dotted lines, is positioned flat upon one end of the zonesubstantially radially of the ridge it and moved along said zone 9 in asweeping curve and with a draw stroke substantially radial to the ridgeH3. At the other end 35 of the zone 9 the razor blade is reversed on itsback edge in the usual manner and the foregoing operation repeated. Inany position of the'blade II on the zone 9 the cutting edge of the blademay engage flat against a sharpening portion of the 40 zone 9 andlikewise in any position of the blade the same may be rolled or rockedtransversely of the zone 9 if such action is deemed necessary toobtaining a proper edge on the blade.

Astone or hone constructed as above described 45 is economical tomanufacture, adapted to withstand long use, provides a surface overwhich a razor blade may be easily manipulated particularly by a novice,and is otherwise thoroughly efficient for the purposes for which it wasde- 50 signed.

Manifestly, the details described in the foregoing may be varied withoutdeparting from the inventive concept disclosed and right is hereinreserved to modifications in such details falling 55 within the scope ofthe claims appended hereto.

What I claim is:

1. A razor hone comprising a substantially rectangular block of abrasivematerial having front and rear sides, two ends and an upper face, saidupper face being concave from end to end of said block and transverselyconvex, the transverse contour being of different curvatures throughoutdifferent zones of said face, said curvatures varying uniformly fromopposite ends of the block inwardly thereof to provide a segmentalsharpening zone extending from end to end of the block inwardly of thefront side and merging at its rear into a transversely convex ridgecurving from the front side in a long sweeping arc.

2. A razor hone comprising a substantially rectangular block of abrasivematerial having front and rear sides, two ends and an upper face, saidupper face being concave from end to end of said block and transverselyconvex, the transverse contour being of different curvatures throughoutdifierent zones of said face, said curvatures varying uniformly fromopposite ends of the block inwardly thereof to provide a segmentalsharpening zone extending from end to end of the block inwardly of thefront side and merging at its rear into a transversely convex ridgecurving from the front side in a long sweeping are, said ridgeconstituting means upon which the blade may be rocked transversely ofthe sharpening zone.

WILLIAM J. KOLLER.

